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On-line waste water respirometer

JanCzek janczek at aol.com
Thu Jan 22 16:17:12 EST 1998

Columbus On-Line  Waste Water Respirometer

We have recently developed On-Line Respirometer which is characterized by
number of innovations making it superior to other instruments  for similar
Instead of dissolved oxygen probes it measures oxygen depletion in the reactor
head space  by the patented principle in the gaseous state. DO probes used in
other respirometers are known to be  plagued by failures while pressure
monitoring respirometers (electrolytic etc.) are sensitive to air leaks and
barometric pressure changes as well as by changes in ambient temperature.
Removing oxygen sensor from the waste water environment makes Respirometer 
much more reliable and opens possibilities to monitor also other evolved  gases
beside oxygen such as CO2,H2S,CH4,H2,NH3 as well as pH. Measuring reactor
contains plastic granules covered with film of bacteria culture grown in the
same waste water environment as being measured. In periodic intervals,  ranging
 from 20 min to 90 min,  determined by rate of  biological degradation  of the
measured waste water sample,  one liter reactor is being refilled with new
sample and head space gasses are being sampled over time  to determine
bacterial respiration through  oxygen depletion. On programmable intervals
glucose  or any other standard solution  is being fed to the reactor to
calibrate bacterial culture to the known BOD level.  Columbus On-Line
Respirometer automatically tests and dilutes waste water to bring measuring
sample to most accurate measuring level.  BOD measuring range is  from 10 mg/L
to 200,000 mg/L. Radio modem transfer data to remote lab or office computer
without need of wiring.
If you like more information  or have any suggestions as to the applications
you may contact me or look at:
where this instrument is shortly described.
Jan Czekajewski,Ph.D.
Columbus Instruments
Columbus, Ohio, USA
ph. (614)276-0861
janczek at aol.com

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